US4558621A - Saw chain for a chain saw - Google Patents

Saw chain for a chain saw Download PDF

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Publication number
US4558621A
US4558621A US06/633,196 US63319684A US4558621A US 4558621 A US4558621 A US 4558621A US 63319684 A US63319684 A US 63319684A US 4558621 A US4558621 A US 4558621A
Authority
US
United States
Prior art keywords
cutting
links
saw chain
link
safety
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/633,196
Other languages
English (en)
Inventor
Karl Nitschmann
Wilfried Linke
Gunter Dietzsch
Werner Hartmann
Hans-Georg Kaiser
Werner Meyle
Hans Dolata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Assigned to ANDREAS STIHL reassignment ANDREAS STIHL ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DIETZSCH, GUNTER
Assigned to ANDREAS STIHL reassignment ANDREAS STIHL ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DOLATA, HANS, HARTMANN, WERNER, KAISER, HANS-GEORG, LINKE, WILFRIED, MEYLE, WERNER, NITSCHMANN, KARL
Application granted granted Critical
Publication of US4558621A publication Critical patent/US4558621A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B27B33/141—Saw chains with means to control the depth of cut
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/909—Cutter assemblage or cutter element therefor [e.g., chain saw chain]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/909—Cutter assemblage or cutter element therefor [e.g., chain saw chain]
    • Y10T83/925—Having noncutting depth gauge

Definitions

  • the invention relates to a saw chain equipped with a safety link and is for use with a motor-driven chain saw.
  • the saw chain of the invention reduces the friction between the chain and the kerf.
  • the effective motor output is thus not subject to such friction losses.
  • the safety link of the invention has a comparatively large moment of resistance providing it with improved stability.
  • the wave-like contour of the upper edge of the safety link prevents chips from accumulating in a single deep recess during the cutting action or, as a result of their length, from becoming wrapped laterally around the rearward projection adjacent to the deep recess, which gives rise to another jammed condition or at least to a further high friction condition between the flanks of the rearward projection of the safety link and the side walls of the kerf.
  • overlapping between the tail end of the rearward projection of the safety link and, when viewed in the direction of movement, the forward projection of the depth limiter of the cutting tooth is avoided. This affords the added beneficial result that cutting chips do not become jammed in an otherwise existing gap caused by the overlap and eliminates the risk of increased friction and thus of a further reduction in cutting efficiency.
  • the wave-like configuration of the upper edge of the safety link affords the advantage of making available an optimum chip space, though restricted in volume.
  • chips collecting in the relatively small or low clearances of the wave troughs can be directed away laterally so that chip buildup is not allowed to occur because the configuration of the invention provides for the removal of chips as they occur.
  • FIG. 1 is a side elevation view of a segment of the saw chain of the invention
  • FIG. 2 is a top elevation view of the segment of the saw chain of FIG. 1;
  • FIG. 3 is a side elevation view of a section of the saw chain of the invention as it moves over the end portion of a guide bar of a motor-driven chain saw;
  • FIG. 4 is an enlarged side elevation view of a safety link of the saw chain of the invention.
  • the saw chain illustrated in the drawing is driven by a motor-driven chain saw (not shown). It runs on a cutter bar 18 secured to the motor housing in the direction of arrow Z (FIG. 3).
  • the saw chain includes a plurality of righthand and lefthand cutting links 1, 2 which are pivotally interconnected to intermediate links, namely: lateral connecting links 3, drive links 4 and safety links 9, by rivets 17 engaging through suitable rivet openings 11, 11'.
  • the saw chain is configured such that the cutting links 1, 2 have connecting links 3 arranged in parallel on opposite sides of the saw chain, and that a safety link 9 is provided between every two consecutive drive links 4.
  • adjacent drive links 4 are connected by the rearward rivet 17', when viewed in the direction Z of chain movement, with the corresponding forward rivet opening of cutting link 2 and the forward rivet opening of the connecting link 3 adjacent the cutting link.
  • the forward rivet or pivot pin 17 extends through the rivet opening 11 in the rearward portion of safety link 9 as well as through the rearward opening of the adjacent connecting link 3.
  • Each cutting link 1, 2 has a cutting tooth 7 including a forward cutting edge 7' and a rearwardly inclined roof 8. Disposed ahead of the cutting tooth is an upwardly extending depth limiter 6 which in the embodiment shown is integrally formed with the cutting tooth; it is to be understood that the depth limiter may also be configured as a discrete component.
  • the forward cutting edge 7' extends in elevation beyond the maximum height of the depth limiter 6 and the depth limiter has its highest point at a vertical maximum distance H from the center-to-center line M, M'. This highest point defines the rearward end point of the depth limiter. From this point forward, the upper edge of the depth limiter 6 extends in a protruding arc over and beyond the forward rivet opening 11'. In the drawing, points s 3 and s 4 approximately designate the convex area of this arcuate shape in the forward portion of depth limiter 6 of cutting link 2.
  • the safety link 9 shown in FIGS. 1 to 4 includes an upper edge 5 having a profile defining a continuous curve having at least two waves.
  • the continuous curve starts from the rearward projection 12 of safety link 9 when viewed in the direction of movement Z of the chain and forms a first wave trough 13.
  • the lowest point P a of wave trough 13 is not lower than five-tenths (5/10) of the maximum height h 1 of the rearward projection 12 of the safety link.
  • the maximum height h 1 is understood to be the distance between the straight line connecting the centers M, M' of the rivet openings 11, 11' of safety link 9 and a parallel line X-X' extending tangentially to the highest point 12' of projection 12.
  • the lowest point P a of the downwardly extending wave portion of projection 12 (wave trough 13) marks a first turning point in the wave-like outline of the upper edge 5 of the safety link. It is followed by a full wave including an ascending portion P a -P 3 and a descending portion P 3 -P b . Thus, the full wave extends between the low points P a and P b on edge 5.
  • the highest point P 3 of this full wave is below the highest point 12' of rearward projection 12 so that a sufficient distance exists between the bottom of the kerf and the convex maximum of the full wave.
  • Another wave extends from the forward second low point P b of full wave P a -P b when viewed in the direction of movement.
  • the crest of this wave is at the forward maximum point P 4 and is in the forward half of safety link 9.
  • the maximum point P 4 extends at most up to the aforementioned parallel line X-X'. From this forward maximum point P 4 , the upper edge 5 descends towards the forward end of the safety link in a convex arc 16 down to the level of the forward rivet opening 11' and continues from there parallel to, and at a sufficient distance from, the rivet opening 11'.
  • This wave-like configuration of the upper edge 5 provides the body of the safety link with a surface sufficiently large to adequately withstand mechanical stresses, strains and loads occurring particularly in plunge-cutting operations or when encountering branches, et cetera.
  • the defined shape and the predetermined spacings of points P 4 and P 3 in relation to the highest point 12' of projection 12 ensure an optimum low friction between the upper edge 5 of the safety link and the kerf bottom, this low friction resulting from a minimum amount of contact surface which is to be considered punctiform in the wave area.
  • the relatively small wave troughs form consecutive recesses along the edge 5 which avoid a major accumulation of chips. Any chips that may collect are easily directed away laterally as they occur, thus preventing friction losses due to chip accumulation or clogging.
  • the locations of the two maximum points P 3 and P 4 of the approximately sinusoidal waveforms of edge 5 in relation to the body of safety link 9 are chosen such that these two points lie in the area between the two rivet openings 11, 11'.
  • the two maximum points P 3 and P 4 are preferably at a sufficient distance a, a' from their nearest respective rivet openings 11, 11', so that any pressure forces or thrusts acting on the maximum points P 3 , P 4 are absorbed at an adequate spacing by the solid material of the safety link body.
  • the maximum height h 1 of the rearward projection 12 of the safety link lies approximately between five-sixths (5/6) and nine-tenths (9/10) of the maximum height H (see FIGS. 1 and 4) of the depth limiter. This height h 1 is preferably nine-tenths (9/10) of H.
  • the maximum height of the forward wave 15' is at point P 4 and is identified by h 2 in the drawing. This height is approximately between seven-tenths (7/10) and nine-tenths (9/10) of the maximum height H of the depth limiter, with h 2 being preferably nine-tenths (9/10) of H.
  • the maximum height of the middle wave crest 15 between points P a and P b is equal to or less than half of the sum of heights h 1 and h 2 , preferably however, this height is six-sevenths (6/7) of the maximum height H of the depth limiter. It is thereby ensured that the middle convex part or wave crest 15, located in the area between the centers M, M' of rivet openings 11, 11', does not extend beyond straight line X-X'.
  • the maximum point P 3 of the full wave between P a and P b is at a distance of about one-sixth to one-third, preferably of one-fourth, of the distance T' between the two centers M, M' of rivet openings 11, 11'.
  • This distance of one-sixth or one-third of T', preferably one-fourth of T' is measured from a line perpendicular to the center-to-center line M, M' and drawn through the center of the rearward opening M.
  • the radius R of the middle convex segment of the full wave P a -P b that ascends towards wave crest 15 to be in the range of between one-tenth (1/10) and three-tenths (3/10) of T' in the center portion or, more specifically, the upper maximum portion on both sides of point P 3 , and secondly, that the distance between the low points of the two concave wave segments adjoining either side of the full wave and parallel line X-X', that is, the height h 4 , to be equal to or greater than two-tenths (2/10) of the height H of depth limiter 6, this latter dimension being preferably at two-tenths (2/10) of H.
  • the wave-like contour may be configured such that the positions of points P a and P b are at different levels within the above-mentioned allowances.
  • height h 4 of point P a may be greater or smaller than height h 4 of forward point P b .
  • the rearward projection 12 of the safety link 9 of the invention protrudes beyond the perpendicular A, A' drawn through the rearward center M of rivet opening 11 by an amount corresponding to five-ninths (5/9) to three-ninths (3/9) of the center-to-center distance T', this projection extending in the opposite direction of movement Z, that is, in the rearward direction.
  • This protruding portion of the rearward projection 12 has been shown to be of optimum configuration if the distance l 3 (see FIG. 1) is of the order of four-ninths (4/9) of T'.
  • the rearward portion of edge 19 defining the tail portion of the body of the safety link is concave.
  • This concave rearward portion of edge 19 corresponds with the adjacent convex arc 20 of the forward portion of depth limiter 6, such that the two arc segments 19 and 20, in particular in the area between points s 1 , s 2 of the safety link and points s 3 , s 4 of the depth limiter are at a minimum spacing 21 from each other, thus avoiding overlapping of the corresponding arc segments 19 and 20.
  • This minimum spacing 21 between the two arcuate edges 19, 20 prevents the arcuate segments 19, 20 from overlapping when the saw chain, after running around the end portion of the bar 18, returns to the straight line of its run. Jamming of chips in an overlapping space between the arcuate segments 19 and 20 which would contribute to increased friction is thereby avoided.
  • the invention provides a saw chain in which, compared to known configurations, the friction between saw chain and kerf is optimally low and additional friction resulting from chip buildup in recesses or chip jamming is avoided.
  • the invention provides for an overall stabilization of the saw chain during its rotation such that kickback is largely eliminated.
  • the arrangement and configuration of the safety link are also suitable for use with a saw chain in which the positions or the arrangement of the cutting links relative to the intermediate links in the chain assembly differ from the description of the embodiment disclosed herein.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Surgical Instruments (AREA)
US06/633,196 1983-07-23 1984-07-23 Saw chain for a chain saw Expired - Lifetime US4558621A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3326643 1983-07-23
DE19833326643 DE3326643A1 (de) 1983-07-23 1983-07-23 Saegekette fuer eine kettensaege

Publications (1)

Publication Number Publication Date
US4558621A true US4558621A (en) 1985-12-17

Family

ID=6204777

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/633,196 Expired - Lifetime US4558621A (en) 1983-07-23 1984-07-23 Saw chain for a chain saw

Country Status (5)

Country Link
US (1) US4558621A (enrdf_load_stackoverflow)
JP (1) JPS6042001A (enrdf_load_stackoverflow)
CA (2) CA1219197A (enrdf_load_stackoverflow)
DE (1) DE3326643A1 (enrdf_load_stackoverflow)
FR (1) FR2549411B1 (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4756221A (en) * 1986-01-29 1988-07-12 Andreas Stihl Saw chain
US5386756A (en) * 1992-08-27 1995-02-07 Andreas Stihl Saw chain for a motor-driven chain saw
DE4190357C2 (de) * 1990-02-20 1999-05-27 Sandvik Ab Feilschablone für das Feilen von Sägeketten
US20030192418A1 (en) * 2002-04-15 2003-10-16 Andreas Stihl Ag & Co. Kg Saw chain
US6748840B2 (en) 2002-08-07 2004-06-15 Blount, Inc. Saw chain having drive link with guard feature
US20070169605A1 (en) * 2006-01-23 2007-07-26 Szymanski David A Components having sharp edge made of sintered particulate material
US20070169598A1 (en) * 2006-01-23 2007-07-26 Szymanski David A Safety chain and rotational devices and replaceable teeth therefor
US20080098870A1 (en) * 2006-10-26 2008-05-01 Blount, Inc., A Limited Liability Company Of Delaware Saw chain drive link with tail
US20080110317A1 (en) * 2006-11-15 2008-05-15 Blount, Inc., A Delaware Corporation Saw chain link with offset footprint
US20080110316A1 (en) * 2006-11-15 2008-05-15 Blount, Inc., A Delaware Corporation Saw chain cutting link with taper
US20110226112A1 (en) * 2008-09-17 2011-09-22 Komatsu Forest Ab Method and arrangement for a sawchain
US20130291702A1 (en) * 2011-01-13 2013-11-07 Husqvarna Ab Kickback reducing chain link
DE102010005966B4 (de) 2010-01-28 2023-06-29 Andreas Stihl Ag & Co. Kg Hobelzahnkette und Motorkettensäge mit einer Hobelzahnkette
USD1012649S1 (en) * 2022-05-18 2024-01-30 Zhejiang Trilink Huihuang Co., Ltd Saw chain
USD1026596S1 (en) * 2022-06-02 2024-05-14 Zhuji Bolin Tools Co., Ltd. Saw chain

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4233176A1 (de) * 1991-10-30 1993-05-06 Firma Andreas Stihl, 7050 Waiblingen, De Saegekette

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425830A (en) * 1981-09-14 1984-01-17 Carlton Company Anti-kickback saw chain
US4459890A (en) * 1980-01-22 1984-07-17 Andreas Stihl Saw chain for power saw

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE582466C (de) * 1933-08-15 Stihl Andreas Saegekette mit Schneidzaehnen und dazwischen angeordneten Raeumzaehnen
US2184461A (en) * 1937-10-04 1939-12-26 Mall Arthur William Chain saw construction
US4353277A (en) * 1980-05-12 1982-10-12 Omark Industries, Inc. Saw chain

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459890A (en) * 1980-01-22 1984-07-17 Andreas Stihl Saw chain for power saw
US4425830A (en) * 1981-09-14 1984-01-17 Carlton Company Anti-kickback saw chain

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4756221A (en) * 1986-01-29 1988-07-12 Andreas Stihl Saw chain
DE4190357C2 (de) * 1990-02-20 1999-05-27 Sandvik Ab Feilschablone für das Feilen von Sägeketten
US5386756A (en) * 1992-08-27 1995-02-07 Andreas Stihl Saw chain for a motor-driven chain saw
US20030192418A1 (en) * 2002-04-15 2003-10-16 Andreas Stihl Ag & Co. Kg Saw chain
US6871573B2 (en) * 2002-04-15 2005-03-29 Andreas Stihl Ag & Co. Kg Saw chain
US6748840B2 (en) 2002-08-07 2004-06-15 Blount, Inc. Saw chain having drive link with guard feature
US20070169605A1 (en) * 2006-01-23 2007-07-26 Szymanski David A Components having sharp edge made of sintered particulate material
US20070169598A1 (en) * 2006-01-23 2007-07-26 Szymanski David A Safety chain and rotational devices and replaceable teeth therefor
US20110120280A1 (en) * 2006-01-23 2011-05-26 Szymanski David A Anti-kickback insertable chain and replaceable teeth therefor
US7836808B2 (en) 2006-01-23 2010-11-23 Szymanski David A Safety chain and rotational devices and replaceable teeth therefor
US20100058915A1 (en) * 2006-10-26 2010-03-11 Blount, Inc. Saw chain drive link with tail
US20080098870A1 (en) * 2006-10-26 2008-05-01 Blount, Inc., A Limited Liability Company Of Delaware Saw chain drive link with tail
US7637192B2 (en) 2006-10-26 2009-12-29 Blount, Inc. Saw chain drive link with tail
US8006598B2 (en) 2006-10-26 2011-08-30 Blount, Inc. Saw chain drive link with tail
US8136436B2 (en) 2006-11-15 2012-03-20 Blount, Inc. Saw chain link with offset footprint
US20080110317A1 (en) * 2006-11-15 2008-05-15 Blount, Inc., A Delaware Corporation Saw chain link with offset footprint
US20080110316A1 (en) * 2006-11-15 2008-05-15 Blount, Inc., A Delaware Corporation Saw chain cutting link with taper
US20110226112A1 (en) * 2008-09-17 2011-09-22 Komatsu Forest Ab Method and arrangement for a sawchain
US9168671B2 (en) * 2008-09-17 2015-10-27 Komatsu Forest Ab Method and arrangement for a sawchain
DE102010005966B4 (de) 2010-01-28 2023-06-29 Andreas Stihl Ag & Co. Kg Hobelzahnkette und Motorkettensäge mit einer Hobelzahnkette
US20130291702A1 (en) * 2011-01-13 2013-11-07 Husqvarna Ab Kickback reducing chain link
US9561600B2 (en) * 2011-01-13 2017-02-07 Husqvarna Ab Kickback reducing chain link
USD1012649S1 (en) * 2022-05-18 2024-01-30 Zhejiang Trilink Huihuang Co., Ltd Saw chain
USD1026596S1 (en) * 2022-06-02 2024-05-14 Zhuji Bolin Tools Co., Ltd. Saw chain

Also Published As

Publication number Publication date
DE3326643A1 (de) 1985-01-31
CA1219197A (en) 1987-03-17
FR2549411B1 (fr) 1986-12-26
DE3326643C2 (enrdf_load_stackoverflow) 1991-08-01
JPH0436041B2 (enrdf_load_stackoverflow) 1992-06-15
CA1242874A (en) 1988-10-11
JPS6042001A (ja) 1985-03-06
FR2549411A1 (fr) 1985-01-25

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Owner name: STIHL, ANDREAS, 7050 WAIBLINGEN, GERMANY A CORP. O

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